FreeCalypso > hg > freecalypso-sw
annotate README @ 715:40a223937246
gsm-fw/cfgmagic/processconf.sh: CONFIG_INCLUDE_PS pulls in g23m-gsm
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Fri, 03 Oct 2014 21:00:30 +0000 |
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1 What this project is about |
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2 ========================== |
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3 |
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4 Welcome to FreeCalypso. The goal is this project is to produce a Free Dumb |
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5 Phone - not yet another smartphone (free or otherwise), but a "dumbphone", |
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6 i.e., a traditional cellular telephone handset just like we all had and enjoyed |
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7 back in the 1990s - a device with just enough hardware resources to make and |
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8 receive traditional phone calls on a standard GSM network, and not one iota |
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9 more. No power-hungry application processors, just have one baseband processor |
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10 that does everything from running the GSM protocol stack to responding to the |
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11 user pressing buttons on the traditional numeric dialpad. No big screens with |
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12 power-hungry backlights, just a little LCD to display who is calling and the |
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13 current date and time - I use my cellphone as a pocketwatch too, so my wrists |
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14 stay free. |
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15 |
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16 But we seek to build a "dumbphone" with one VERY SPECIAL twist: namely, |
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17 operational firmware for the phone (which includes everything from the UI down |
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18 to GSM Layer 1, as there is no separate baseband processor) available to every |
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19 end user in the form of full source code. Hence it will be a Free Dumb Phone. |
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20 We seek to achieve this "special twist" by doing the following: |
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21 |
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22 * We'll use the ancient TI Calypso chipset for our Free Dumb Phone instead of |
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23 whatever is the current offering from MTK or other cellular chipset company |
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24 du jour. TI stopped making these chips ages ago, and got out of the cellular |
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25 baseband chipset business altogether, but we can still source these chips in |
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26 5-digit quantities on the Chinese surplus market. |
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27 |
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28 * Because we'll be using a baseband chipset from the surplus market made by a |
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29 company that long bit the dust, we will not be getting any official firmware |
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30 releases from any vendor. Therefore, there is no one to sign any NDAs with, |
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31 and there is no one to tell us what we can or cannot do with the firmware as |
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32 we won't be getting any official firmware in the first place. |
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33 |
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34 * Our Free Dumb Phone will run free firmware which we put together ourselves. |
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35 When TI completely exited the cellular baseband chipset business, closed all |
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36 their offices involved with that work and laid off all of the responsible |
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37 employees, they broke their firmware into pieces and threw the pieces in the |
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38 trash. We have picked these shattered pieces out of the trash dumpster, and |
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39 like anything else found in a dumpster, these abandonware pieces are |
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40 effectively in the public domain, and any person in the world is free to do |
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41 with them as she pleases. |
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42 |
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43 The "shattered pieces" aspect of the firmware needs to be re-emphasized. TI's |
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44 complete firmware suite for their Calypso chipset, also known as TCS2.1.1 or |
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45 TCS211, has *not* survived the disbanding of its maker company in an intact |
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46 form. Shattered bits and pieces are all we've been able to gather through our |
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47 dumpster diving efforts. |
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48 |
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49 Reconstructing fully-functional firmware for the Calypso from the available |
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50 broken pieces is where the bulk of the hard work in our project is. There is |
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51 another project (bb.osmocom.org) seeking to produce similarly-functional fw by |
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52 rewriting it completely from scratch with a totally different architecture, but |
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53 the lead developer of the present FreeCalypso project has chosen the |
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54 reconstruction approach as more reliable and more likely to produce the desired |
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55 result. |
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56 |
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57 Hardware vs. software |
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58 ===================== |
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59 |
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60 Our goal is to produce a complete and usable cellphone product. Such a product |
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61 requires both hardware and software (firmware). We need to produce both. We |
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62 could do the hw and fw subprojects in either order, but we have chosen to work |
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63 on the firmware first. By doing the fw first, we will get to exercise it on |
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64 some existing phones that use the same Calypso chipset; doing the hw ahead of |
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65 the fw would give us a fancy paperweight. |
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66 |
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67 Current status |
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68 ============== |
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69 |
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70 We are currently using the Calypso GSM modem in the Openmoko GTA02 smartphone |
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71 as our bring-up vehicle. We have our own firmware suite, compiled 100% from |
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72 source with gcc (no blobs or proprietary compiler toolchains!), but we have not |
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73 yet reintegrated the full GSM protocol stack in this project. (The leo2moko |
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74 side project doesn't count.) But we are getting close: we've got the |
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75 FreeNucleus RTOS by XVilka as a working replacement for the binary-only version |
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76 of Nucleus used by TI, and we've got the following parts of TI's original |
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77 firmware suite integrated and working: |
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78 |
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79 * RiViera framework and everything that runs under it, including TI's original |
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80 FFS (flash file system), RVTMUX serial channel and ETM (Enhanced Test Mode). |
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81 This part has been found in a TCS211 semi-src package. |
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82 |
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83 * GPF (Condat's protocol stack framework) - TI used it mostly as binary libs, |
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84 even internally, and we had to reconstruct it from pieces. Some parts of GPF |
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85 had to be reconstructed from disassembly. But it works beautifully now. |
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86 |
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87 * GSM Layer 1 code - we took the version from the LoCosto source (no official |
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88 Calypso L1 source could be found) and backported it from LoCosto to Calypso. |
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89 |
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90 We are now working on reintegrating the rest of the GSM protocol stack code, |
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91 also taking it from the LoCosto source (the only available full source) and |
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92 reintegrating it to build in our FreeCalypso environment, targeting Calypso |
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93 instead of LoCosto. |
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94 |
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95 We have also produced some host tools for loading firmware into Calypso GSM |
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96 devices, for communicating with running firmwares over the RVTMUX interface, |
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97 and for manipulating TI's flash file system. See README.hosttools for the |
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98 details. |
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99 |
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100 Source tree |
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101 =========== |
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103 The subtrees of this source tree are as follows: |
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104 |
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105 gsm-fw The main FreeCalypso GSM firmware work, see above. |
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106 |
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107 target-utils This tree contains code that runs on Calypso targets, but is |
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108 not regular firmware (gsm-fw) or a part thereof. The two key |
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109 components built in this tree are loadagent (needed for all |
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110 targets) and compalstage (for Compal phones only), which need |
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111 to be installed on the user's host system in order for |
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112 loadtools (see README.hosttools) to do their job. |
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113 |
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114 ffstools Tools that run on a Unix or GNU/Linux host; see README.hosttools |
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115 loadtools for the details. |
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116 miscutil |
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117 rvinterf |
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118 |
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119 toolchain Scripts and patches for building the gcc+binutils toolchain |
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120 targeting ARM7, the CPU core of the Calypso GSM/GPRS baseband |
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121 processor. You'll need to build and install this toolchain |
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122 first before you can build gsm-fw or target-utils. |
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123 |
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124 If you like this project and would like to see it continue to fruition, please |
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125 consider making a Bitcoin donation to the human family behind it: |
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126 |
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127 https://blockchain.info/address/159Yx6JRJ4oMLPTYrh1jW7fQ5D5tPHdnoM |